摘要
对不同负载、不同流速下圆柱振子所受流体升力、振动位移及发电机输出电压进行测试,分析能量传递和转换过程中的流体升力和动力响应特征,以及升力系数、位移幅值、转换功率及效率随流速的变化.结果表明,位移幅值和响应频率受负载电阻的影响较小,发电机输出电压、输出功率及能量转换效率受负载电阻的影响较明显,随负载电阻的变化为非单调;当负载电阻增加到一定值时,其对升力的影响变得非常小.升力特征随约化速度的变化而变化.当约化速度小于5.0时,升力频率成分较为单一,频谱只有一个谱峰,其脉动曲线的正负幅值较对称;当约化速度大于5.0后,出现了倍频成分,使正幅值明显大于负幅值.
The lift force,vibration displacement and the output voltage of the generator at different flow velocities for different load resistances were measured.The lift coefficient,the response amplitude and frequency,the harnessed power and energy conversion efficiency with the change of current velocity were obtained and analyzed.The analysis reveals that the load resistance has weakly effect on the response amplitude and frequency,but significant effect on the output voltage of the generator,harnessed electrical power and energy conversion efficiency,and the effect is non-monotonic;the effect of the load resistance on the lift coefficient is very weak when it increases to a certain value.The characteristic of the lift changes with the reduced velocity.With the reduced velocity less than 5.0,the power spectrum of the lift coefficient shows a single frequency component,and the positive and the negative amplitudes are symmetrical;as the reduced velocity increases above 5.0,a double-frequency component appears in the spectra,and the positive amplitudes are significantly higher than the negative ones.
作者
李小超
徐伟
周熙林
赵利平
LI Xiao-chao 1,2 , XU Wei 1, ZHOU Xi-lin 1, ZHAO Li-ping 1(1. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, ChangshaUniversity of Science and Technology, Changsha 410004, China;2. Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha University ofScience and Technology, Changsha 410004, China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2018年第7期1370-1375,共6页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(51309038
51679015)
湖南省自然科学基金资助项目(2018JJ2435)
可再生能源电力技术湖南省重点实验室开放基金资助项目(2014ZNDL001)
关键词
涡激振动(VIV)
能量转换
升力
振动响应
vortex-induced vibration （VIV）
energy conversion
lift force
vibration response
